A compound tube has a length of 750 mm and is fxed between two rigid supports. It consists of a copper tube of external diameter 100 mm and internal diameter 87 mm encasing a steel tube of external...

A compound tube has a length of 750 mm and is fxed between two rigid supports. It consists of a copper tube of external diameter 100 mm and internal diameter 87 mm encasing a steel tube of external diameter 87 mm and internal diameter 75 mm. Determine the stresses set up in the tubes as a result of the temperature being increased by 40°C. The steel has a modulus of elasticity of 210 GPa and a coeffcient of linear expansion of 12×10^–6
per °C and the copper a modulus of elasticity of 130 GPa and a coeffcient of linear expansion of 17×10^–6
per °C.